End frame ring for motors



May 24, 1927.

J. F. LiNcOLN END FRAME RING FOR MoToRs Filed Avril 26. 1924 J INVENTOR. J ..5277 C0272 M y ATTO/e m5 by l 5 Patented May 24, 192:7o

unirno- TES lwl@

TET OFFICE..

JAMES E. LINCOLN, or oLEvELAND, omo7` assIaNorN 'ro THE LINCOLN ELECTRIC CoM- rANY, or CLEVELAND, omo, .a ooRrona'rroN or omo.

EN@ FRAME @KHG :FR MOTORS.

application tiled April 26, i924. Serial No. gt'tl` ln motors and similar electric machines, ythe universal practice heretofore, so tar as l am aware', has been to make the :trames or rings which holdvthe 'laminations of the stator together ot cast iron. l'llhe object ot the present invention is to provide asteel end trame for use in this connection in order to provide a strong and more dependable con struction. At the same time the parts can be made of smaller dimensions, thereby permitting of some very important improven ments in design.

'llo the accomplishment ot the foregoing and related ends, the invention, then, consists oit the means hereinafter fully described and particularly pointed out in the claims, the annexed drawing" and the following description setting forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one ot various mechanical 'forms in which the principle of the invention may be used.

ln said annexed drawing Fig, 1 is partly a side elevation and partly a central vertical setion ot a typical motor wherein my improved end trame rings have been employed; Fig. 2 is a side elevation and Fig. 3 an end plan View of one such ring by itself; while Fig. 4 is a plan view of the straight angle bar from which such end ring is fashioned; and Fig. 5 is a transverse section of such bar.

The only parts in the motor assembly vshown in Fig. l, to which attention need be directed in. the present connection, are the stator 1 and the two end rings 2, one on each side of the stator, whereby the laminations *composing the latter are held together and supported in proper position about the rotor 3. n

As shown in Figs. 4 and 5, each end ring 2 is made from a straight steel angle bar 5, the one -lange 5Il of which is somewhat Wider than the other flange 5b. At the respective ends of the bar said flange 5* is beveled as shown at 5 (Fig. 4), so that when the bar is rolled into circular shape, the beveled faces 5 will contact on a radial line. To facilitate the bending of the angle into the desired circular, shape and to retain the ends in proper abutting relation during the weldl ing operation, a hole 5d is provided in the flange 5b adjacent each suchend. The weld 6 (Fig. 3) is preferably elfected by means of an electric arc, using an arc pencil of suitable metal to lill in any space that may be lett due to imperfect fitting of the beveled :taces 5. of dange 5" and the juxtaposed end faces of dange 5a.

After the angle iron has thus been bent to circular form and its ends welded together, ventiler-tingv ducts 7 are drilled or otherwise formed in said flange 5b as well as bolt holes Sthrough which pass the bolts 9 (see Fig. l). whereby the assembled parts are held together. A. hole l0 is similarly drilled or formed at one point in the flange 5a in which is inserted and fixed the base of a ring 1l whereby the motor may be lifted about7 as 'found necessary. Feet l2, on which the motor is 'designed to rest, are finally welded at suitable oppositely spaced points on the flange 5a et each ring 2.-

My improved steel end frame ring l have found eliminates the breakage experienced with cast iron in assembly and service. At the same time it is not only much stronger but decidedly less bulky than any equivalent castiron structure, thus afording much less obstruction to passage of air through the motor by way ot' the Ventilating passages 7, hereinbefore referred to. rllhis ventilation is doubly etdective because the steel end ring is in better proportion than it is possible to ,make a cast iron ring, no reinforcing webs being needed and the bulk being materially less so that a very tree passage of air is permitted 'between the trame and coils.

A consequential saving in cost is also achieved, tor not only, as pointed out above, is a saving edected in weight ofmetal employed, it being necessary to use only onethird to one-halt as many pounds to do the same work, but the steel employed in my improved construction normally Will cost less than half as much per pound as cas iron.

llt will be understood that while l have described my improved end frame ring as being fabricated from a steel angle bar. structural steel of other cross-s`ectional forms may be similarly used to thesame or nearly the same advantage.

Other modes ot applying the principle of my invention muy be employed instead of the one explained, change being made as regards the mechanism herein dlsclosed, provided the means stated by any of the following claims or' the equivalent'of such stated means be employed.

i I therefore particularly point out and distinctlf'claim as my invention 1. n a

vof a Supporting frame therefor, said frame including two end rings, each ringbeing made from an 'elongated structural steel member formed into a circle and having its ends welded together. 1

2. In a dynamo-electric'machine, the com- .bination with the annular laminated stator;

of a supporting frame therefor, said frame including'two end rings,' each ,ring being 'made from an elongatedstructural steel member of angular cross-section formed into a circle and having its ends welded together,

one portion of the member lying substantallyl in theplane of the ring and said stator being held between 'such portions of the vtwo rings. A'

3. In a dynamo-electric machine, the combination with the annular laminated stator;

of-a' s upporting frame therefor, said frame dynamofelectrlc machine, the combination with the annular laminated stator;"

including two end rings made from a steel angle bar formed intoga circle and havin including two end rings made from a steel angle bar formed into a circle and havin its ends welded together with one flange o said bar constituting a cylindrical portion and the other a flat inwardly directed portion of the end ring2 such cylindrical portions of the two end rings .being directed outwardly and said stator being held between the juxtaposed flat portions .of said end rings.

Signed by me this 24th day of April, 1924.

y JAMES F. LINCOLN. 

